Featured Research

from universities, journals, and other organizations

Changing Ocean Conditions Led To Decline In Alaska's Sea Lion Population

Date:
March 25, 2007
Source:
Marine Conservation Alliance
Summary:
Scientists revealed that a sudden ocean climate change 30 years ago may be a leading factor in the decline of Alaska's endangered western stock of Steller sea lions.

A new study out of Alaska points out the impacts of climate change on marine ecosystems, and the need for increased research and stronger science based management to address future concerns.

Studies by a team of scientists at the North Pacific Universities Marine Mammal Research Consortium revealed that a sudden ocean climate change 30 years ago changed today's Alaska marine ecosystems, and may be a leading factor in the decline of Alaska's endangered western stock of Steller sea lions.

Theories why the Steller sea lion population declined by more than 80 percent during the 1980s include pollution, commercial fishing, and subsistence harvesting. The new study points instead to a climate regime shift--a natural event in the ocean's climatic cycle--in the late 1970s that may be responsible for current regional population of about 40,000, compared with 235,000 in the 1970s.

The publication, entitled Bottom-up forcing and the decline of Steller sea lions in Alaska: assessing the ocean climate hypothesis found that climate change affected water temperatures and ocean currents determining the abundance of available fish for the sea lion's to eat. Changes in prey led to a decline in the sea lion population. Using interdisciplinary research methods was key in determining the root cause of the sea lion decline.

The need for such research is echoed in a related report: "Conserving Alaska's Oceans," prepared by Natural Resources Consultants. The report outlines 30 years of improved ocean conservation in the waters off Alaska with recommendations for future action. The report makes ten recommendations for continued improvement, including the need to address climate impacts, embrace the goals of ecosystem based fishery management, and the need to strengthen science programs to address future uncertainty.


Story Source:

The above story is based on materials provided by Marine Conservation Alliance. Note: Materials may be edited for content and length.


Cite This Page:

Marine Conservation Alliance. "Changing Ocean Conditions Led To Decline In Alaska's Sea Lion Population." ScienceDaily. ScienceDaily, 25 March 2007. <www.sciencedaily.com/releases/2007/03/070322160633.htm>.
Marine Conservation Alliance. (2007, March 25). Changing Ocean Conditions Led To Decline In Alaska's Sea Lion Population. ScienceDaily. Retrieved July 28, 2014 from www.sciencedaily.com/releases/2007/03/070322160633.htm
Marine Conservation Alliance. "Changing Ocean Conditions Led To Decline In Alaska's Sea Lion Population." ScienceDaily. www.sciencedaily.com/releases/2007/03/070322160633.htm (accessed July 28, 2014).

Share This




More Earth & Climate News

Monday, July 28, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Asteroid's Timing Was 'Colossal Bad Luck' For The Dinosaurs

Asteroid's Timing Was 'Colossal Bad Luck' For The Dinosaurs

Newsy (July 28, 2014) The asteroid that killed the dinosaurs struck at the worst time for them. A new study says that if it hit earlier or later, they might've survived. Video provided by Newsy
Powered by NewsLook.com
The Carbon Trap: US Exports Global Warming

The Carbon Trap: US Exports Global Warming

AP (July 28, 2014) AP Investigation: As the Obama administration weans the country off dirty fuels, energy companies are ramping-up overseas coal exports at a heavy price. (July 28) Video provided by AP
Powered by NewsLook.com
Raw: Sea Turtle Hatchlings Emerge from Nest

Raw: Sea Turtle Hatchlings Emerge from Nest

AP (July 27, 2014) A live-streaming webcam catches loggerhead sea turtle hatchlings emerging from a nest in the Florida Keys. (July 27) Video provided by AP
Powered by NewsLook.com
Trees Could Save More Than 850 Lives Each Year

Trees Could Save More Than 850 Lives Each Year

Newsy (July 27, 2014) A national study conducted by the USDA Forest Service found that trees collectively save more than 850 lives on an annual basis. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins